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Proton Helicity GPDs from Lattice QCD
Miller, Joshua Bhattacharya, Shohini Cichy, Krzysztof Constantinou, Martha Gao, Xiang Metz, Andreas Mukherjee, Swagato Petreczky, Peter Steffens, Fernanda Zhao, Yong
Miller, Joshua
Bhattacharya, Shohini
Cichy, Krzysztof
Constantinou, Martha
Gao, Xiang
Metz, Andreas
Mukherjee, Swagato
Petreczky, Peter
Steffens, Fernanda
Zhao, Yong
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Conference proceeding
Date
2024-05-02
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Physics
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https://doi.org/10.22323/1.453.0310
Abstract
First lattice QCD calculations of x
-dependent GPD have been performed in the (symmetric) Breit frame, where the momentum transfer is evenly divided between the initial and final hadron states. However, employing the asymmetric frame, we are able to obtain proton GPDs for multiple momentum transfers in a computationally efficient setup. In these proceedings, we focus on the helicity twist-2 GPD at zero skewness that gives access to the H˜
GPD. We will cover the implementation of the asymmetric frame, its comparison to the Breit frame, and the dependence of the GPD on the squared four-momentum transfer, −t
. The calculation is performed on an Nf=2+1+1
ensemble of twisted mass fermions with a clover improvement. The mass of the pion for this ensemble is roughly 260 MeV.
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Sissa Medialab
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Proceedings of The 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)
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